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Charles Gall
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Publication of GB190709342ApublicationCriticalpatent/GB190709342A/en
9342. Gall, C. March 25, [date applied for under Patents Act, 1901]. Speaking-tubes.-In a speaking-tube applicable for use in road vehicles, the axis of the mouthpiece is perpendicular to the common axis of the speaking- tube, whistle, and air ball. The vibrating metallic strip g serves to direct the sound of the whistle e along the speaking tube, and also to amplify the vibrations set up by the voice of the speaker.
GB190709342D1907-03-251907-04-22Improvements relating to Speaking Tubes.
ExpiredGB190709342A
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